Lennox Hearth P/N 775 024M Rev. C Manuale Utente

Page 25 

1. Fire burns with 

a lazy orange 

flame. Pellets 

build up in the 

grate and the 

window soots 

up. 

 

There is insufficient combustion air. 

 

Remove any clinkers or ash from the bottom of the grate that 

might be obstructing the primary air holes.  

 

Change to a better grade of fuel if necessary. 

 

Check that the damper has been properly adjusted (see 

Damper Adjustment Guidelines on page 16). 

 

Inspect heat exchange tubes for ash buildup and remove 

ash if necessary. 

 

Clean internal exhaust ducts. 

 

Check if door is sealing properly (see “Door Rope Gasket” 

on page 20 for test procedure). 

 

Check for blockage in the air inlet tube or exhaust pipe. 

Clean as necessary. 

 

Close ash slide plates. 

 

Have your authorized Lennox Hearth Products dealer check 

your combustion blower. 

 

2. Fire goes out 

or stove shuts 

down automati-

cally 

 

The hopper is empty 

 

Pellets are not feeding.  

 

The high limit disc has tripped. 

 

 

 

 

 

 

 

There is too much combustion air 

for the amount of fuel. 

 

Refill hopper. 

 

See pellets will not feed on this page. 

 

Allow stove to cool for 1 hour and re-light. If the stove has 

been operating at a medium to high burn rate and the con-

vection (room air) blower has been turned down low then the 

blower should be turned up higher. If this problem persists 

(particularly at lower burn rates), then the high limit disc 

should be replaced by your authorized Lennox Hearth Prod-

ucts dealer. 

 

Adjust the damper to reduce combustion airflow. (see 

Damper Adjustment Guidelines on page 16). 

 

3. Pellets will not 

feed. 

 

Stove has run out of fuel. 

 

The auger motor or circuit board 

may be defective. The pressure 

switch tap or hose may be blocked.  

 

 

Back pressure in venting tripping 

pressure switch. 

 

 

 

High limit disc may have been 

tripped. 

 

Self-aligning bearing in auger motor 

may be mis-aligned. 

 

Refill hopper. 

 

Check to ensure that there is no blockage in the pressure tap 

or hose. Have your authorized Lennox Hearth Products 

dealer diagnose the problem and clean or replace any nec-

essary parts. 

 

If new installation check for excessive 90˚ bends, long hori-

zontal runs or excessive vertical run of 3” pipe. Possibly 

change to 4” pipe. If older installation check for excessive 

ash accumulation in pipe or other obstructions. Clean out 

pipe. 

 

Allow stove to cool. 

 

Gently tap the auger motor.